Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos gerentes de palco de produção trabalharam com Gabriel di Chiara como o Rep Masculino?
 ###Tabelas: CREATE TABLE crime_statistics:_1995_2011_non-homicide (crime_statistics:_1995_2011_non-homicide_id AUTO_INCREMENT PRIMARY KEY, Year INT, Population INT, Total INT, Violent INT, Property Crimes INT, Forcible rape INT, Robbery INT, Aggravated assault INT, Burglary INT, Larceny Theft INT, Vehicle Theft INT) CREATE TABLE jersey_progression (jersey_progression_id AUTO_INCREMENT PRIMARY KEY, Stage INT, Winner VARCHAR, General classification VARCHAR, Points classification VARCHAR, Mountains classification VARCHAR, Sprints classification VARCHAR, Team classification VARCHAR) CREATE TABLE division_races (division_races_id AUTO_INCREMENT PRIMARY KEY, Week INT, EASTERN #1 VARCHAR, Eastern #2 VARCHAR, WESTERN #1 VARCHAR, Western #2 VARCHAR) CREATE TABLE division_championships (division_championships_id AUTO_INCREMENT PRIMARY KEY, Season INT, Division VARCHAR, Coach VARCHAR, Overall Record VARCHAR, Conference Record VARCHAR, Result VARCHAR, Attendance INT) CREATE TABLE past_board_members (past_board_members_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Chairman VARCHAR, Artistic Director VARCHAR, Performance Liaison VARCHAR, Secretary VARCHAR, Business manager VARCHAR, Production Stagemanager VARCHAR, Dramaturge VARCHAR, Public Relations VARCHAR, First/Second Year Rep. VARCHAR, Male Rep. VARCHAR)  
SELECT COUNT Production Stagemanager FROM past_board_members WHERE Male Rep. = Gabriel Di Chiara